为提升您的使用体验，本站正在维护，部分功能暂时无法使用。如果本站文章无法解决您的问题，您想要向社区提问的话，请到 Twitter 上的 @FirefoxSupport 或 Reddit 上的 /r/firefox 提问，我们的支持社区将会很快回复您的疑问。

Avatar for Username

搜索 | 用户支持

防范以用户支持为名的诈骗。我们绝对不会要求您拨打电话或发送短信，及提供任何个人信息。请使用“举报滥用”选项报告涉及违规的行为。

详细了解

话题已存档。 如果需要帮助请提出新问题。

WebRTC firefox[47.0.1] client lowers the bitrate to very low values sometimes till 0.02 Mbps.

  • 2 个回答
  • 1 人有此问题
  • 4 次查看
  • 最后回复者为 Standard8

mzak
mzak
more options

Hello,

Outgoing H.264 call from webRTC Firefox client version 47.0.1. We use the H.264 codec with packetization-mode=0 version.

We observe strange behavior of the Firefox browser - it lowers the bitrate of 

the outgoing call to very low values of the bitrate sometimes till 0.02 Mbps.

We do not observe packet loss, so it could not be the reason to lower the bitrate.

The video section [excluding ICE/TURN/STUN/SRTP stuff] of our SDP is below:

m=video 60020 RTP/AVP 108 c=IN IP4 31.168.3.180 b=TIAS:1200000 a=rtpmap:108 H264/90000 a=fmtp:108 profile-level-id=42801f; max-fs=3600; packetization-mode=0 a=content:main a=label:1 a=rtcp-fb:* ccm fir a=rtcp-fb:* nack pli a=sendrecv

We cannot explain the reason why firefox client lowers the bitrate. The issue does not happen with chrome 52 beta- supporting H.264. Do you have any suggestion what could be the reason of the lowering bit-rate?

Thanks in advance Michael

Hello, Outgoing H.264 call from webRTC Firefox client version 47.0.1. We use the H.264 codec with packetization-mode=0 version. We observe strange behavior of the Firefox browser - it lowers the bitrate of the outgoing call to very low values of the bitrate sometimes till 0.02 Mbps. We do not observe packet loss, so it could not be the reason to lower the bitrate. The video section [excluding ICE/TURN/STUN/SRTP stuff] of our SDP is below: m=video 60020 RTP/AVP 108 c=IN IP4 31.168.3.180 b=TIAS:1200000 a=rtpmap:108 H264/90000 a=fmtp:108 profile-level-id=42801f; max-fs=3600; packetization-mode=0 a=content:main a=label:1 a=rtcp-fb:* ccm fir a=rtcp-fb:* nack pli a=sendrecv We cannot explain the reason why firefox client lowers the bitrate. The issue does not happen with chrome 52 beta- supporting H.264. Do you have any suggestion what could be the reason of the lowering bit-rate? Thanks in advance Michael

由mzak于修改

所有回复 (2)

mzak
mzak 提问者
more options

Hi,

We checked: when we work with packetization-mode=1 - everything works perfect. Apparently the problem exists only in single NALU mode, I recommend not to use packetization-mode=0 at all in SDP - if it does not work good.

Best Regards Michael

Standard8
Standard8
more options

Hi, I would suggest posting this to the dev.media mailing list:

https://lists.mozilla.org/listinfo/dev-media

That's where most of our WebRTC experts hang out and should be able to provide you with a good response.